# US 12,184,047 B2 · Easy pull electrical conduit

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- Number: US 12,184,047 B2
- Document ID: US12184047B2
- Status: Granted
- Kind: B2
- Application number: 17/474,439
- Filed: 2021-09-14
- Published: 2022-03-17
- Granted: 2024-12-31
- Earliest claimed: 2020-09-16
- Assignees: Penn Aluminum International LLC
- Applicants: Penn Aluminum International LLC
- Inventors: Jerry W. Nies; Barton C. Potter; Manikantha R. Daggula; Kenneth R. Bolding
- Web page: https://patentgrep.com/patent/US12184047B2

## CPC

- H02G 1/08: through tubing or conduit, e.g. rod or draw wire for pushing or pulling {(inserting electrical cables into tubes using wallbores E21B17/206; for optical cables G02B6/4401)}
- H02G 3/0481: {with a circular cross-section (H02G3/0468, H02G3/0475 take precedence)}
- F16L 9/14: Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups (F16L9/16 - F16L9/22 take precedence)
- H02G 3/0462: {Tubings, i.e. having a closed section}
- H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL

## Abstract

An easy pull conduit for receipt of wire and/or wire bundles reduces the resistance to pulling wire and/or wire bundles. The conduit has an inner surface and a boron nitride coating applied to the inner surface. An aluminum EMT conduit having the boron nitride coating exhibits a 55 percent reduction in pull force compared to a bare aluminum conduit. A method for reducing the pull force required to pull wire and/or wire bundles through a conduit is also disclosed.

## Claims

### Claim 1

A conduit for receipt of wire and/or wire bundles, the conduit having reduced resistance to pulling wire and/or wire bundles, comprising:
a conduit having an inner surface; and
a boron nitride coating applied in a carrier to the inner surface, wherein the boron nitride is present in a concentration of at least 85% by weight in the carrier.

### Claim 2 (depends on 1)

The conduit of claim 1, wherein the conduit is an aluminum conduit.

### Claim 3 (depends on 2)

The conduit of claim 2, wherein the aluminum conduit is an electrical metal tubing (EMT).

### Claim 4 (depends on 3)

The conduit of claim 3, wherein the conduit exhibits a 55 percent reduction in pull force compared to a bare aluminum conduit.

### Claim 5 (depends on 1)

The conduit of claim 1, wherein the conduit is rigid metal conduit.

### Claim 6 (depends on 1)

The conduit of claim 1, wherein the conduit is an intermediate metal conduit (IMC).

### Claim 7 (depends on 1)

The conduit of claim 1, wherein the conduit is a steel conduit.

### Claim 8 (depends on 1)

The conduit of claim 1, wherein the conduit is polyvinyl chloride (PVC) or fiberglass.

### Claim 9 (depends on 1)

The conduit of claim 1, wherein the carrier is a liquid carrier.

### Claim 10 (depends on 9)

The conduit of claim 9, wherein the carrier is water.

### Claim 11

A method for reducing the pull force required to pull wire and/or wire bundles through a conduit, comprising:
providing a conduit having applied to an inner surface thereof boron nitride, wherein the boron nitride is applied in a carrier and wherein the boron nitride is present in a concentration of at least 85% by weight in the carrier; and
pulling a wire or wire bundle through the conduit.

### Claim 12 (depends on 11)

The method of claim 11, wherein the boron nitride is applied by brushing, spraying, dipping or powder coating.

### Claim 13 (depends on 11)

The method of claim 11, wherein the carrier is water.